There is no clear and strict definition of roll film in the packaging industry, it is just a common term in the industry. Simply put, the rolled packaging film is only one less process for packaging production enterprises than the production of finished bags. Its material types are also the same as plastic packaging bags, such as PVC shrink film roll film, OPP roll film, PE roll film, pet protective film, composite roll film, etc. Film rolling is applied to automatic packaging machines, such as commonly used bag shampoo and some wet wipes, which use this packaging mode. The cost of using roll film packaging is relatively low, but it requires an automatic packaging machine. In addition, in our daily life, we will also see a kind of roll film application. In small stores selling cup of milk tea, Congee, etc., we will often see a kind of on-site packaging sealing machine. The sealing film it uses is roll film. The most common roll film packaging is bottle packaging, and generally uses heat shrink roll film, such as some cola, mineral water, etc. Especially for non cylindrical shaped bottles, heat shrink roll film is commonly used.